Getting Kicked Out

I installed ED Engineer to my PC and Ctrl-F10 is my toggle. I launch it before Elite and Ctrl-F10 to minimize. Sometimes (in the game) if I Ctrl-F10 it takes me to the desktop where there is the ED Engineer Screen. Sometimes (in the game) when I Ctrl-F10 ED Engineer comes up in Elite but if I click on it, ED Engineer just goes away and I find it open on the desktop. Seems like most people just install and use without any problems. Any ideas?
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